Combined comparator and limit gauge



M 27, 1948. A, H EMERY mama COMBINED COMPARATOR AND LIMIT GAUGE Filed Feb. 29, 1944 INVENTOR ALFRED H. EMERY ATTORNEYS Patented July 27, 1948 COMBINED COMPARATOR LIMIT GAUGE Alfred Hamilton Emery, Wappingers Falls, N. Y.,

assignor to Standard Gage Company, Inc., Poughkeepsie, N. Y., a corporation of New York Application February 29, 1944, Serial No. 524,357

3 Claims. (Cl. 33-447) The present invention relates to a combined indicator having features generally attributed to a snap or limit type of gage and likewise features generally attributed to a comparator type of gage.

More particularly still, the invention relates 5 vided the usual U-shaped snap a efra to a gage capable of indicating whether a piece which is an iron casting properly dimensioned for measured is within the go and no go limits the particular range of measurement intended. setforth andat the same time capable of showing n t e lo r arm f this a e, as s en nto exactly what point within those limits the ure 2,tthere is a plane surfaced measuring butpiece has been processed. t ton I2 which is adjusted withrespec't to'the frame Iii-general, the gage-of this invention comprises in the usual manner and is locked in its ada U-shaped frame of the type generally utilized justed position in any suitable manner. a for snap gages carrying a stationary plane sur- In the upper arm of the frame member H faced button in one arm thereof and in theother .there .is supplied .a gaging button l3. Likewise arm thereof a spherically surfaced button, the fastened in this arm is a housing M in which a central portion of which is movable whereby the dial indicator gage 15 (of the type shown in my dimension set between the stationary anvil and above mentioned patent) is fastened .byany suitthemovablecentralportion of the measuring butable means as for example the screws 3 0. The ton when that portion is at one extreme of its housing IBM-above mentioned is suitablyfastened movement, constitutes a no go measurement, in the framemember ll thisbeing accomplished andthe distance between the anvil andthe movby screwing the epending portion of the housin able portion of the measuringbutton whenat the M into the threaded bore 1] in the arm 0f the other extreme of this movement, constitutes the ease I I as .is.clear1ysho.wn in Figure 1. Whenso. go measurement. In this device the movable positioned .the housing isllockedbymeans of the central portion of the measuring button co-acts look or jam nut [8 which bears. against the upwith the plunger of a dial gage such as that illusper arm .of the frame vmember M. Dial age 15 trated in "my Patent No. 2,226,756 of December is provided with an extension I9 for its usual 31, 1940. Thus the exact measurement of any contact plunger which extensioniis screwed into piece within =the-tolerance limits set may be read thetplunger. .It will lsbe noted that this extension by observation of the dial indicator. l9-is smaller than the diametertof the depending -It is an object of this invention to provide a portion of the housing 1.4 so that no {contact "is combined comparator and snap or limitgage. made-between these twopieces;

-Itis a further object of this invention to provide Theuppe m asu n b tfifl fl fi ly 13150111- such an-Vinstrument in which the movementof the prises a sleeve 20 which is t externally .threadefl plunger of the-dial gage is so limited as to make and mates'with the internally threaded bore Jl it impossible to operate the gage beyond its of the upper arm of the frame, the sleeve being working limits and thereby-damage the gage. provided witha look nut 3.1 by; whichiit maYi-be Itis a still further object of this invention to held .in its adjusted position. -5 6 16 2 115.91- provide acombined instrument in which-both the 40 minates .at its (lower end in the enlar ed sty inmain dimensionto be measuredrand-the tolerance dricalportion, lthe=lower face ,of which is ground may be adjusted and in which such adjustment and lapped to a spherical surface as is clearly willrnot interfere with proper reading of the dial shownin Figures land 2. v v r indicator. Thetinternal .bore ofmeniber #20 is enlargedat 'Other objects and. features of the invention its lower end as is clearly indicated .in Figure '1 t will appear .when the following disclosures are to form a cavity in which a spring '22 is placed. consideredvin connection with the appended draw- MeniberZlLis further enlarged below this cavity to ings in which: forma chamber in which.a central portion 2| of Figure l is-a fragmentary cross-sectional view themeasuringbuttonLisinserted,.Ithisgbuttonbeof one arm "and one measuring button of the inggroundand lapped at its'lower surfarcetoiform" combined dial.

'2 t Figure 2 is an elevation of the combined gage of my invention.

Referring now to the drawings and particularly Figure 2 thereof, it will be seen that there is pro-- a continuation of the'lower surface ofthe sleeve 20 above described. Button 2| is provided with a shank or stem 29 which extends through the internal bore of the sleeve 20. The shank 29 is threaded at its upper end and is provided with the lock nuts 32 and 33 by means of which the range of tolerance of the instrument may be adjusted, in other words, by means of which the amount of play between the rear face of the button 2| and the shouldered chamber in the sleeve 20 may be adjusted. The spring 22 being placed in the cavity before mentioned and being a compression spring tends to hold the button 2| in its outer orlower position'w-i-th the lock nut 32 resting against 'the end of sleeve 20.

The adjustment of nuts 32 and 33 is always such that the distance between the rear face of button 2| and the shoulder of the chamber in which it operates is always less than the maxi lnally adjustably mounted in said second arm, re-

mum range of the dial indicator l5 which assures the indicator l5. It will be clear-nowthat if the 4 indicator while the piece is in position between the anvil l2 and measuring button 2|.

While I have described a preferred embodiment of my invention it is to be understood that other forms may be substituted therein and consequent- 1y, I do not wish to be limited by the foregoing description but on the contrary, I prefer that the scope of my invention be determined solely by the appended claims.

What is claimed is:

1. In a combined comparator and limit gage, in combination, a U-shaped frame, an anvil mounted in one arm of saidframe, a measuring element comprising an outer sleeve and inner button mounted in the second arm of said frame, said button having a shank which extends through said sleeve, said sleeve being longitudi- .silient means for urging said button to its outer lock nuts 32 and 33 are so adjusted onthe shank 29 of button 2| as to make the total'movement of the button equal to the range of tolerance, and the position of the sleeve 20 in the frame adjusted sothat the dial indicator'indicates the lower tolerance limit and, furthermore, jthe stationary anvil |2 adjusted (with J ohansson orI-Ioke blocks equal to the set dimension in position thereon) until the dial indicates zero then any piece which is below the lower tolerance limit will fail to cause a reading of the dial indicator, while any piece which is between the tolerance limits will pass between the measuring .buttons and will cause, a reading of the dial indicator during. its

out .offits upper measuring frame, the adjustment above described being accordingly altered, of'coursa, I

The mode of adjusting the instrument may be madeclearer by takinga specific example. Let it'be assumedjthat a piece is to be measured, the standardized dimension of which is 1.0000 inch, plus or'min'us 0.0002inch. The upper measuring button i3 is removed from the instrument and set by use of any suitable means such as a dial indicator or J ohansson blocks so that the movement of the button 2| thereof is 0.0004 inch.

Following this the button I3 is replaced in the instrument and adjusted in the bore until the hand of thedial indicator l5 gives a reading of minus 0.0002. Next, a Johansson or Hoke block or a stack of such blocks isplaced'on the lower anvil l2 and the anvil then adjusted until the reading of the dial indicator hand is zero. The instrument is now ready for use and it willbe seen that any piecewhose dimension is less than 0.9998 will cause no: reading 'of the dial indicator gage thereby indicating that the piece is outside of the tolerance limits. Moreover, any'piece which is greater than 1.0002 inches will fail to pass between theanvil and the measuring button since the rear face of the button l3 will have made contactwith the shoulder of the cavity in the sleeve member'ZO as has beendescribed. Each piece may in, addition, if desirable, be checked.

as to its exact reading by merely reading'the dial position with respect to said sleeve, adjustable means for limiting the movement of said button with respect to said sleeve to limit the movement to the overall tolerance permitted, a dial indicator likewise adjustably mounted in said second arm of said frame, said motion limiting means serving to prevent operation of the dial indicator beyond its range, and means for transmitting movement from said button to said can indicator said adjustment of said sleeve in said; upper arm serving to set the gage so that the dial indicator reads zero whenthe measured piece is of a selected dimension between the upper and lower tolerance limits.

2. Ina combined comparator and limitgage,

in combination, a U-shaped frame, an anvil mounted in one arm of said frame, ameasuring element comprising an outer sleeve and inner button mounted in the second arm of said frame, said button having a shank which extends through said sleeve, said sleeve being longitudinal ly adjustably mounted in said second arm, adjustable means for limiting the movement of said button with respect to said sleeve to thereby set the overall tolerance, a housing rotatably and linearly adjustably mounted in said second arm 'of saidframe, and a dial indicator mounted in said housing with its plunger extending intothe said second arm of said frame and making contact with the shank of said measuring buttonjto transmit measuring movement from said measuring button to said dial indicator, said rotatable mounting of said indicator housingserving to renderthe indicator readable from anydesired position said linear adjustment of said housin .and said sleeve serving to set the dial indicator V to indicate zero when the pre-selected linear measurement between the tolerance limits exists between the measuring button and said anvil.

3. In a combined comparator and limit gage,

in combination, a U-s'haped frame, an anvil mounted in one arm of said frame, a dial 'indi-' cator housing adjustably mounted in a borein the second arm of said frame, a dial indicator mounted in said housing with its plunger extending into the said bore, a measuring element corn-I prising an outer sleeve and an inner measuring button said sleeve b eing'long'itudinally adjust ably mounted in said bore in said second} arm, a shank on said measuring button, extending through said sleeve and making contact with said dial indicator plunger, resilient means for extending said measuring button and .its shank outwardly with respect to said sleeve, means comprising a shouldered chamber in said sleeve for limiting the inward movement of saidmeasuring 5 6 button with respect thereto and means com- UNITED STATES PATENTS prising lock nuts on said shank for limiting the outward movement of said button with respect Number Name D ate 903,484 Lane et a1. Nov. 10, 1908 to said sleeve, whereby the range of movement 1 491 613 Miner A r 22 1924 of said measuring button may be limited and the 5 1664583 Wk 8 3 X 1928 lemme f HAMILTON EMERY 118921969 Schneider 1111111111 .1511: s: 1933 1 1,921,791 Syme Aug. 8, 1933 REFERENCES CITED FOREIGN PATENTS The following references are of record in the 10 Number Country Date file of this patent: 203,718 Switzerland Mar. 15, 1939 Certificate of Correction Patent No. 2,445,875. July 27, 1948.

ALFRED HAMILTON EMERY It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Column 4, line 41, claim 2, after then/0rd and comma arm, insert resilient m Signed and sealed this 5th day of October, A. D. 1948.

THOMAS F. MURPHY,

Assistant Oommissianer of Patents.. 

